chore: Define default resource and data source documentation template

[andreaangiolillo]

Description

Ticket: https://jira.mongodb.org/browse/CLOUDP-222897

Context:

• Currently all generated documentation requires a new template to be defined.

Proposed Solution:

• Define a generic template for resources as well as single/plural data sources.

For documentation that requires no specific changes the default template can be used and no new template needs to be created. In case specific adjustments are needed, the default template will serve as a starting point to define the new template.

Type of change:

• Bug fix (non-breaking change which fixes an issue). Please, add the "bug" label to the PR.
• New feature (non-breaking change which adds functionality). Please, add the "enhancement" label to the PR.
• Breaking change (fix or feature that would cause existing functionality to not work as expected). Please, add the "breaking change" label to the PR.
• This change requires a documentation update
• Documentation fix/enhancement

Required Checklist:

• I have signed the MongoDB CLA
• I have read the contribution guidelines
• I have checked that this change does not generate any credentials and that they are NOT accidentally logged anywhere.
• I have added tests that prove my fix is effective or that my feature works per HashiCorp requirements
• I have added any necessary documentation (if appropriate)
• I have run make fmt and formatted my code
• If changes include deprecations or removals, I defined an isolated PR with a relevant title as it will be used in the auto-generated changelog.

Testing

I ran export resource_name=cluster && make generate-doc and chcke that the default template was used.

[AgustinBettati]

A small detail

[AgustinBettati]

I believe we can remove this from the default template right? Not sure if we are capable of leaving this generic. Applies to the data source template as well.

[andreaangiolillo]

I believe we can remove this from the default template right? Not sure if we are capable of leaving this generic.

we can have the import autogenerated if we define an import.txt in the example folder. similar to https://github.com/mongodb/terraform-provider-mongodbatlas/pull/1394/files#diff-ab6cba42e3e4a9f3642faec48e42d41f668902c8ffa3041a36bbc56e01c59913. What do you think?

applies to the data source template as well.

data sources do not have the import